Well ideally I'd rather have both. However I'd like to point out that have too much quantity can kill the quality. I haven't played Portal myself, but I have considered getting it off Steam, I just got to be careful about my game purchases right now. Anyway, to reference Yahtzee's review of Portal, part of what made Portal great, according to Yahtzee, was that it was so short; it "didn't wear out it's welcome." I can't back this up, as I haven't played it yet as I already mentioned. I think it's important to balance quality and quantity and I imagine getting the perfect ratio is an incredible challenge for devs.